Filter key device



FIG. 1 is a top, front, right side perspective view of a filter key device, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top, back, right side perspective view thereof;

FIG. 7 is a top, back, left side perspective view thereof;

FIG. 8 is a top, front, left side perspective view thereof;

FIG. 9 is a bottom, back, left side perspective view thereof;

FIG. 10 is a bottom, back, right side perspective view thereof;

FIG. 11 is a bottom, front, left side perspective view thereof; and,

FIG. 12 is a bottom, front, right side perspective view thereof.

The broken line showing of various features of the filter key device form no part of the claimed design. 

CLAIM The ornamental design of a filter key device, as shown and described. 